Vertical calculation method and writing format of mathematics in senior one.

The vertical calculation method of addition: number alignment: one digit to one digit, ten digits to ten digits, plus sign moving forward. The calculation starts with single digits, and the sum of single digits makes the number written on single digits, and the sum of ten digits makes the number written on the tenth digit.

2. Vertical calculation methods of subtraction: digit alignment, digit-to-digit, digit-to-digit, and negative sign moving forward. Calculation starts with numbers and negative numbers, so that numbers are written as numbers and negative numbers, so that numbers are written as numbers.

3. Vertical calculation refers to a vertical calculation in the calculation process, which makes the calculation simple.

When adding, the same numbers are aligned. If the total exceeds 10, proceed to 1.

5. In subtraction, the same numbers are aligned. If the subtraction is not enough, borrow a digit from the previous digit as 10.